<template>
    <div class="todo-footer">
        <label>
        <input type="checkbox" :checked='ischeck' @change="Allcheck"/>
        </label>
        <span>
        <span>已完成{{donetotal(todoObj)}}</span> / 全部{{todoObj.length}}
        </span>
        <button class="btn btn-danger" @click="deletedone">清除已完成任务</button>
    </div>
</template>

<script>
export default {
    name: 'todofooter',
    props: ['todoObj','allcheck','deledone'],
    computed:{
        ischeck(){
            return this.todoObj.length===this.donetotal(this.todoObj)
        }
    },
    methods:{
        donetotal(todoObj){
            return todoObj.reduce((pre,current)=> pre+(current.done== true?1:0) ,0);
        },
        Allcheck(e){
            this.allcheck(e.target.checked);
        },
        deletedone(){
            this.deledone()
        }
    }
}
</script>

<style scoped>
    .todo-footer {
    height: 40px;
    line-height: 40px;
    padding-left: 6px;
    margin-top: 5px;
    }

    .todo-footer label {
    display: inline-block;
    margin-right: 20px;
    cursor: pointer;
    }

    .todo-footer label input {
    position: relative;
    top: -1px;
    vertical-align: middle;
    margin-right: 5px;
    }

    .todo-footer button {
    float: right;
    margin-top: 5px;
    }
</style>